September 23, 2024

M35 & NGC 2158 – Open Clusters in Gemini

M35 & NGC 2158 – Open Clusters in Gemini

Telescope: Meade SN10 at f/4, Orion Atlas EQ-G

Camera: Full Spectrum Modified Nikon D810

Filter: GSO IR Blocking Filter

Guide scope: Williams Optics 50mm, ASI290MM mini, PHD

Exposure: 50x20sec, ISO 200, saved as RAW

Darks: Internal (Long Exposure Noise Reduction)

Flats: 32×1/50sec, tee shirt flats taken at dusk

Average Light Pollution: Red zone, poor transparency

Lensed Sky Quality Meter: 18.2 mag/arc-sec^2

Stacking: Mean with a 1-sigma clip.

White Balance: Nebulosity Automatic

Software: Backyard Nikon, Nebulosity, Deep Sky Stacker, Photoshop

Through a small telescope M35 is rather delicate and appears as a beautiful patch of stardust that just keeps on getting better as you use larger and larger scopes. NGC 2158 is the much smaller and fainter cluster to the lower right of M35. The apparent smaller size and red color of this cluster is a result of it being much farther away than M35; 16,500 light years versus 2,800 light years. NGC 2158 makes a fine companion to M35 in large telescopes.

M35 is currently in the western sky at dusk.